If AI units are responding and their lightbar is blacked out, you will have to fix it in the vehicles meta. In order to find which diffusetint you need to change, go to the search bar on the editing thing and type in the vehicle name that you have that vehicle under. Like I have the state police explorer set under police4, so I just search "police4" next you will have to scroll down on that vehicle until you find it's diffusetint and make sure it is set to "0x00FFFFFF".